Program.cs

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Http;
using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.ChatCompletion;
using Microsoft.SemanticKernel.Connectors.OpenAI;
using Microsoft.SemanticKernel.Plugins.Web.Bing;

var openAIChatCompletionModelName = "gpt-3.5-turbo"; // this could be other models like "gpt-4o".

var builder = Kernel.CreateBuilder();

// injecting services to the kernel such as logging, http client, redaction.
builder.Services.AddLogging(b => b.AddConsole().SetMinimumLevel(LogLevel.Trace));

builder.Services.ConfigureHttpClientDefaults(b =>
{
    b.AddStandardResilienceHandler();
    b.RedactLoggedHeaders(["Authorization"]);
});
builder.Services.AddRedaction();// Adds the redaction service, which will redact sensitive information from logs and other outputs.

// injecting the permission filter to the kernel.
builder.Services.AddSingleton<IFunctionInvocationFilter, PermissionFilter>();

var kernel = builder
    .AddOpenAIChatCompletion(openAIChatCompletionModelName, Environment.GetEnvironmentVariable("OPENAI_API_KEY")) // add the OpenAI chat completion service.
    .Build();

kernel.ImportPluginFromObject(new Microsoft.SemanticKernel.Plugins.Web.WebSearchEnginePlugin(
    new BingConnector(Environment.GetEnvironmentVariable("BING_API_KEY"))));

var settings = new OpenAIPromptExecutionSettings() { ToolCallBehavior = ToolCallBehavior.AutoInvokeKernelFunctions };// Set the settings for the chat completion service.
var chatService = kernel.GetRequiredService<IChatCompletionService>();
ChatHistory chatHistory = [];

// Basic chat
while (true)
{
    Console.Write("Q: ");
    chatHistory.AddUserMessage(Console.ReadLine());// Add user message to chat history, then it can be use to get more context for the next chat response

    var response = await chatService.GetChatMessageContentAsync(chatHistory, settings, kernel);// Get chat response based on chat history

    Console.WriteLine(response);
    chatHistory.Add(response);// Add chat response to chat history, hence it can be use to get more context for the next chat response
}

class PermissionFilter : IFunctionInvocationFilter
{
    public async Task OnFunctionInvocationAsync(FunctionInvocationContext context, Func<FunctionInvocationContext, Task> next)
    {
        Console.WriteLine($"Allow {context.Function.Name}?");
        if (Console.ReadLine() == "y")
        {
            await next(context);
        }
        else
        {
            throw new Exception("Permission denied");
        }

    }
}